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Communication method and device for a motor vehicle

a communication method and motor vehicle technology, applied in data switching networks, instruments, process and machine control, etc., can solve the problems of increasing greed in passband for “passenger compartment functions” and losing the initial advantages (low cost, low interference) of the lin network

Active Publication Date: 2012-03-29
VALEO VISION SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This method reduces the load on the LIN network by shortening status word transmission and eliminating identification data transmission, improving response times and maintaining the cost-effectiveness of the LIN standard for advanced lighting systems.

Problems solved by technology

During the developments of the standard, the main characteristics of the LIN network were not fundamentally modified, and its transmission speed is still limited to 20 Kbps owing to constraints of electromagnetic compatibility and clock synchronisation without the use of a quartz crystal or ceramic resonator.
However, the “passenger compartment functions” prove to be increasingly greedy in terms of passband, in particular those relating to the AFS (Advanced / Adaptative Front Light System) advanced lighting system.
But the initial advantages (low cost, low interference) of the LIN network would be lost.
A second solution would be to change standard and use more advanced networks such as CAN, but there again the cost would be prejudicial.

Method used

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  • Communication method and device for a motor vehicle
  • Communication method and device for a motor vehicle
  • Communication method and device for a motor vehicle

Examples

Experimental program
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first embodiment

[0057]According to the invention, corresponding to FIG. 3, the master station M sends an identifier 4 with the value 3C, that is to say a master request, to all the slave stations S1, S2, S3, S4.

[0058]These each respond in their turn in the frame initiated by the identifier 4 with the code 3C to the reception of a succession of activation identifiers 6 with the code 7D by placing in series on the bus their specific data frames 7 with the values DS1, DS2, DS3 and DS4 followed by end-of-frame blocks 8 consisting of respective checksums CKS1, CKS2, CKS3 and CKS4.

[0059]A comparison of the timing diagrams of FIGS. 1 and 3 makes the reduction in load on the bus provided by the method according to the invention obvious. This is because the status words 7 of the slave stations S1, S2, S3, and S4 sent in a command frame are advantageously shorter than the minimum of two bytes of a message frame.

[0060]The same observation can be made by comparing FIGS. 2 and 3. This is because there is no tra...

second embodiment

[0061]According to the invention, corresponding to FIG. 4, reading of the status of the slave stations S1, S2, S3 or S4 by the master station M is implemented by the latter by sending an identifier 1 with a code lying between 00 and 3B, that is to say an identifier 1 corresponding to a message frame.

[0062]In response to this identifier 1, each of the slave stations S1, S2, S3 and S4 sends, each in its turn, a sub-frame 9 with the value D1, D2, D3 or D4 in order to fill the data frame of the message.

[0063]The last slave station S4 completes the series of sub-frames 9 sent with a checksum 10 calculated on all these sub-frames 9.

[0064]The advantage of this second embodiment of the invention in terms of load on the bus compared with the standard LIN protocol also appears clearly by comparing the timing diagrams of FIG. 4 with those of FIGS. 1 and 2:[0065]transmission of the same message identifier 1 for several slave stations S1, S2, S3, S4;[0066]a single data frame for the four slave s...

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Abstract

A communication method is implemented in an on-board network between a master station (M) and a plurality of slave stations (S1, S2, S3, S4), of the type of those compatible with the standard Local Interconnect Network (LIN) protocol in which data frames are sent by the slave stations on a serial bus in response to the sending by the master station of identifiers representative of the required content of the frames. All or part of each of the specific data frames attached to the same predetermined identifier is formed sequentially by each of the slave stations. This enables an optimisation of the load on a LIN network, thus enabling use of this economical standard for all “passenger compartment functions”, and in particular for the management of AFS type advanced lighting systems.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application is a divisional of U.S. patent application Ser. No. 11 / 458,213 filed Jul. 18, 2006, which claims priority to French Application No. 0507636 filed Jul. 19, 2005, which applications are incorporated herein by reference and made a part hereof.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention concerns a method and a device for communication on an on-board network, in particular for a motor vehicle, compatible with the LIN standard, in order to optimise the load on this network.[0004]2. Description of the Related Art[0005]The use of an ever greater number of electromechanical devices in motor vehicles has led to an increase in the number of electrical circuits. In order to reduce the growing complexity of the wiring, “network” or “bus” techniques, already known in the computing field, have been adapted to the constraints of the automotive world.[0006]The essential functions of vehicles are g...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): G06F13/36
CPCH04L12/403H04L2012/40234H04L2012/40273
Inventor FLANDRE, LOÏCSADOUX, GRÉGOIRE
Owner VALEO VISION SA
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